.tabbar-layout{
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 48px;
    z-index: 100;
    box-shadow:0 -4px 4px rgba(0,0,0,0.15) ;
    background-color: fff;
}

.backtotop{
    position: fixed;
    bottom: 60px;
    right: 10px;
    z-index: 110;
}

.backtotop-hidden{
    display: none;
}